add some snippets are role and directive to reStructuredText
Merge pull request #12 from hachibeeDI/add-rst

add some snippets are role and directive to reStructuredText
Fix try_resources
tex.snip: remove \begin{appendix}
tex.snip: improve \begin{figure}
tex.snip: add \begin{align}
Merge pull request #13 from syngan/tex

update tex.snip
Improve PHP snippets.